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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3a8ab6f66012adecac41203bb23c0fcf8472365658050add3125c77283e70eb2' 
  AND token = 'tPCt0T11/WXCdYhpmmFameuB1ROMDr4jsRpyCiLNU1s=' 
  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"
    }
  }
}