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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d662c0634ca45953f716c67e67102ae0a3a892f6b6d88154964255e602a3ff0' 
  AND token = '6gt6m0xEvTzk2gLfkPD02Z19E42hxNy3Fv7DrFFub24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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