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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514bb1d691ae6c224d81554c4a60de4215f5bc70884effec57311a47d0f8c172' 
  AND token = '00ZrHGAb0KA04OjChU+ZBP1eU1dzo5DEf7UU2Jkm2u8=' 
  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"
    }
  }
}