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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b2844f18d1567270cff1e7a8a5bdb572808fcae4c8e1b8d97cfc7f22d4017b' 
  AND token = '7BSyuUNHdrj+bBOHaFy6MhPKb1OcaczUYaXBg5L5Q8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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