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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b75a5ca440ad301a4d0df68d8d3e473ac6b7044c7343f3489938add627cc81' 
  AND token = 'Am6npZIvulZbMg5l1z5toWx1K8WhYym8ZJozm4Pw/bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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