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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5318d075a1f4f7a0ae6d334005a2660b2b8dfb2fe1c683a4f5e948b6f59d6312' 
  AND token = 'bkSlQAPIsuM3TswJOjvLbmLviQ9BF8VDiIdlgvQptXQ=' 
  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"
    }
  }
}