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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e09511c1794942b164df3dcba0c2b6ef1cfa82424e4ac43e3858fa9c90466d' 
  AND token = 'iuZiQ4R/uqCP10rVeK9Zdzi+I1VaELSryHH6KMSIexE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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