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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7e9a888ad873a9e38edd035aab81b08345005c2d28ff31016cfe0ff0aa0555' 
  AND token = 'TzkHw1U1ysGWncJ37q/XWc5xCN/R3V+SKGtOBOn86lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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