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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4f2c50a9676100ef9170a614cd16962229d2d8a08043a1d76c478cc09fd899' 
  AND token = 'IkAc7NiW+7cdxahGFHdM8lNDln9HDXFIRu8zRB0ELlg=' 
  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"
    }
  }
}