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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1c3e808e088df68ec163a9e3ffe815b8d6c9e516bffcad27a63de38c4523a83d' 
  AND token = 'N/dEEYwSnK+QAm4agFu3AFStlxnBMQ1dtv2F+mXfeMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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