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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959a178a11430715af5ccfbd07f632ac4db2532ff58fc0d8608f99a73485dbe2' 
  AND token = '66oZzfRBNQF0JlnjzxvGpiYORLE8aJth334k0tre5wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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