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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4578b2979550c1b8cbe21c50be51389ea8b9332852de1f3f43e407a1df536fd' 
  AND token = '+eXj9XQucJnysiYz1qn5OeJ9GX56EgcczhzBrmwoLTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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