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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f48e7218558d338bcca5465bef43a6ba639d9f4ed72ba57576c73dfcf2d8c426' 
  AND token = 'FiLzLPtZMq7tY2FRao+56206bahQUUexVW2n3yde+wk=' 
  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"
    }
  }
}