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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae540d3c985cefd6a27128673ffc1d1fffe56a2a748de14e01796fa360e4325' 
  AND token = 'owlKW648uEvlina7Q8HU50ys2e853kSfqT2T7K3x5qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}