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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ed6e1a31f143860ec1f6c01865ebd371e6a75ada1bb88c94f6e88b513afb2c' 
  AND token = '9pg2Lnb6stZvES8hBE2ASwU6IVeSv7OXnocVxuDWS+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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