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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d09453f859a2eb3527d8b938894b5f9ab4b0ee073958f4cc36014e35891d86b' 
  AND token = 'C5AVb+14HZzEbn5wbGPOJJa1viEqzzxDS/WD3WRg1pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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