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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1313e1d36b69cabf2729019b07f6ee286d687c2e96bf066adfac3a73eb814b90' 
  AND token = 'ZM/O8Oyu/f/1U3WB0sdsv7wtiC4/Xp4EB9FD6rsBz4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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