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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ee2c52ced6b15023d27612171c38ad6f28f5b65c12ee3055c6dceb66bfd1aefc' 
  AND token = 'W3q/v3AnS9T/lTOXE+i0qYeTwpDTiifF4RqjD+Ae9CY=' 
  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"
    }
  }
}