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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b9e4e88441564a21c7189559a557d993c81cd581b3fa21964b00b96250e6b7' 
  AND token = 'a5UonIN7gLRlzOBJ5zZDPXNnnFEyDFuh3CKjtNaP2k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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