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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2a31c2ff02ffc80fd14d364a9ea2bb70a1769b145099f3d2a0adbabe05afcf' 
  AND token = 'u1IiGbVyj1RCb2mm0FS0pXPtXWeJmpevq5NUUPDnqXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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