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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d38ea96c8173e7cc2004596f39cdaa7da82e12c05b246103940de721a18cf4b' 
  AND token = '+frBhFnPqgFBvrm26tpux0Jv42X2GPPDgPMtZvb4RqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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