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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a645c657cef8302aae314b6468681ed7203623660356c57e3cd5736a7b16106f' 
  AND token = '7+Dc4PRSm8rmtRTm90297AhqQ/v+I/rwycPtwoD0vuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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