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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0199c924d9e26eb2c7ddbc14b022928c69807b6039d1e0c63fa9f8bebe433a1c' 
  AND token = '05+ZQCbwUrhttGnIBXvNOX9XAbM6V2+Dn1s8w1OEQ3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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