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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af2a1ff8e9c79bf6023919ead7327af9e8fdf4c46d7b00786e797b6cb4acec0' 
  AND token = '30sCKKEubv4I/kQaEE71yjM5FlePDfFCwIGFLqGxPqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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