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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a5f7596044b34245e28efa684e5f298ca8c2dc853141227edc75000abfd426' 
  AND token = '/Dq2PM5PYbi1jcJvxkJIPeFdYXYZffdkEUgj1wn8MgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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