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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'af0b087ecc63f06e230ed14394f9a0b33d6188962311b1e7e0b4556957ca14aa' 
  AND token = '+Jv7NjwMW9+ZLTwVlZNNRL2ER9ngbq4rYEdS08aSoAw=' 
  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"
    }
  }
}