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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b9943b0567cfdd9ded0fd919765aca7da7c7ec2d70f0666b297d80bcaae0c0fb' 
  AND token = 'f5WVyUn6iJ/hRg5pKLMfhYVFQCNOAodLo+peEp0f/HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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