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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0b74cfcca9b7c8225f637f71ec619dbfdd0caf8d3390d3cb6bfeac480dd2e5' 
  AND token = 'eW6Zfepw+Z72oQBh/S2E/DbqeU4/IPo6+HqqgKa/9CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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