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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c956f35b7bcd602234b0dfa0b4e67dd16acdef9e81dcac26ecd2ef6e05c8bb12' 
  AND token = '1VJDVQT3Ltgufc5ji4xErO+nxIAi+7bt9ZlBzYZEuT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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