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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c577b8a560bd03ec4090f904c45da1dae3e609822e3509889051255ce831bd66' 
  AND token = 'dzJ04TNEFwGY8jHn/vFZSvVhtp09Pi9Pqnt3r5hrjz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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