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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97d331cd12fc5691271e95742c97f40a194bcc8a6659c2e37f6c8fe62434a96' 
  AND token = 'Yh8iReionBGF0Yx4f2+PhhgkIf7yCUNv3ilKW9lqEr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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