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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3a5b5324261545db7eb4e20b4449b23d79ddd9891e1d7825db345967f89c20' 
  AND token = 'gjHn+UwIFbOtVkKLP3+t0vqaF29EIa63OPrM07HrYI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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