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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1cacf01d382ecd67c720e4091f5fdc74c2bd5a04346bfefeafb0ca03a27605' 
  AND token = 'ehHkotzDI5CxV8olCncFa2ixslwGuJmOEzpdHXt/lmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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