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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfa4e8a2e1e246041b2f9780bc1b1c35836297924596bc204e90ba8809983b4' 
  AND token = 'EKal8Wv//M6iRhixRWYyy8t9bGwyDT750V+3g/hrv1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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