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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20aeb6016ceb9c709ca73f2c4f8613350b85c23cd832f6b9a03a942a6ed7d537' 
  AND token = 'EoxfbedUz3L41ah3TE1sMvO64BItM378e+0q7MxJjPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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