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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff7980d0c94e28e1ffa6b27027937376b5837d348d3b32437c8bec37ee793f2' 
  AND token = 'zYDw+stzR1DebMpnRFb9Vsq82hSHcud3hiPW/cRMQNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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