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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1fa4b1253d297f6534307fd1cb35ad2db77ed1c14d4d2b3d9d3841f922a98cfc' 
  AND token = 'lyRcGtSugh7Dj91X1rR5Lb5nMgJg8GMrZWn+k4lfCKI=' 
  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"
    }
  }
}