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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540f545e271e1991f55df6b5ffe04f2a803d380b607a6e4ea784b1d7a4379771' 
  AND token = 'UV5G4aB5YdVX6aua8sNYq34s5yrWGtFu3cBScsOXtFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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