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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577b3abde82ab411a28e54bf5ff2b46c4a69c7f48dd8793823e6a203b18724bb' 
  AND token = 't8ewDE8pkSjaS5/7AIDO23HrWQ5DSUXZK7quSH3yOic=' 
  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"
    }
  }
}