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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1998de53c3725c203a16384ba0d262f427c8f1090da2813c02be871abcd2e48' 
  AND token = 'i4AXZ+ZtWROIuCQAlB5M2L/Qs2Gd3zAgXS0DZn7TTx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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