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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '175e6b11ac29ad613128748df347a8baa7df4b4d14ed16b5c036daa4f841a285' 
  AND token = 'apK16RhNj80HwhisgOtxFzoKCtq9whuo3LBuR1u1Nx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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