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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e3d8456d77ce0632252a8e41f4dab937fb8fec45c6109b2aea0813528609a3' 
  AND token = 'hsq/mMOSJZ05UbtT7pK1hgpt8mSpEOkZaSdIvzbdZWs=' 
  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"
    }
  }
}