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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8012d831c4f55cd27fec513710a778c9d83f2103a061a450331e5a053a41a5' 
  AND token = 'l97jH7icw6S5/KA3FVvxHJTLczTU95jIuQRuMI/8I5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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