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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4bbdb38c166498fd8cf64b60635bd674816fa7e7b78e4a851bb9f0e774c2d5' 
  AND token = 'J8VvRBUqXuqqDrE9NWxfekUQ6wMV1YEl9rfd+uzX4W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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