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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a881245b48b046f29f2131806816dd8b80138c5c30c4d59f26cbb23116a93711' 
  AND token = 'mqIrbyKIvSS3ianTj6E3ASjDsZSu+4R1WoQ3tU0H1ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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