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SELECT 
  1 
FROM 
  cscart_aprilec_print_temp_designs 
WHERE 
  session_id = 'RVCB-LLX3-B2UF-19NI-ZVYV-MDWA-53NP-YO38' 
  AND product_id = 95 
  AND expires_at > 1778182108 
  AND confirmed = 'Y' 
LIMIT 
  1

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}