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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51045d3e9033b295819486b769f18e1c4bef4ff2d6793dd46ffc287d75deb904' 
  AND token = 'ojCbxkjgHNDAgm/ihSfRXXcpH0IzlBeEbsWBgV0abBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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