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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d8347fe57313cebbc8c54aaa488059369664f4395000fc92929ae19a02a7541' 
  AND token = 'xpjgHK7/z3/3SJq7TPHPZNeabZt/qg3GuZ5sGW2Q2p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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