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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e909c6e58944a907a2ad989bd17b259736bc707e72d3fb8f914ea86805b86b0d' 
  AND token = 'XjfxqfFmIBCaKFrKde2BurDxZgB7V8BI+kWebA4aDxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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