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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0932bc623c0de8102409a8cbb6b1ff49d5eea38ab94daa985d316393d7bcaa2' 
  AND token = 'RPfFLnK3f3zTRyNRbCQrQkT+ePuWFFyC2snyL/smcLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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