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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aea0b4a1d57daa95f586c9c4e969fd0de7483388a25e232d6260e49544dc18' 
  AND token = 'tGHvzKA7M8BvnMc/THtl8+Pe36yJ7SoBwGVbz2oYU2Q=' 
  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"
    }
  }
}