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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f986644f3923c484fedc1ae4dc83f3c64bd0c64938dcda9f4a46c300e95641' 
  AND token = 'FOCPDktIig242jy/DbEdgbnyu+mP8ncPGlw4e/K+uyA=' 
  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"
    }
  }
}