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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7899968d6c7f4069fc050d10faf9e2804bab791da4ac2ca44b61e7a2ebf3adbb' 
  AND token = 'PHV10GiXtxn8obcFOtuuF910Sn6dSjsGCncqhVB7Sts=' 
  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"
    }
  }
}