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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5e2ac044f47ee43f64e12b0a6095c3934bf21f2f3dba6789781a9ee5bf6a891e' 
  AND token = 'oRk1ah5R0Ye0yAGPr76pF4wIOIa4GcWR49QnF+Ve7B4=' 
  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"
    }
  }
}