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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7201d296bd647b77c2217b423215f6467cf0a6ca14e096ec481485fe00c302c0' 
  AND token = 's5P4NEDBS5gDS2wih+6tIyUWJOoZm34t6b6+EBVK04o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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