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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '51c857c95af46ebb9ca48fe7ff26befc1e9a33ce6745cc5b23fff3750f5afc49' 
  AND token = '0hrqRCTbA5hRtR+ZK9446wSAeWr2FCa/TfRlfSbtBkk=' 
  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"
    }
  }
}