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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8c0778a9a05a18f76082f2cb1f9f6b8ff40e3ead1048501d9475467be7ee6a42' 
  AND token = 'MDPwls9mxp+y9KD/IWMxsVoj0lXkgKJusADm/t82Oik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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