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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27be2b48c6a3371c8efff0e6bc56633aa962ddf9f224fb8fa83830142768ff05' 
  AND token = 'KD71omd0P2TUfBW4e7kbG0d1BekG6pZDC3hl7DPDYPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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