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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c1dc54af173f42c0aeff656f4300a526489cedec33a25394cd8ba3d71ce50aff' 
  AND token = '3RG5l2zAmqpCmCQ4rwcceTSpv8U/9ALWplMT/kE84sQ=' 
  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"
    }
  }
}