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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b5110234d44fd54be1d9b720c0af4c7ee9a462156ccd64d435534c258dc14f' 
  AND token = 'LOLr8qMAOdgl23U7i3kS9EH2ac0BqJ3PglKFdTELQwY=' 
  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"
    }
  }
}