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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be25dd32435ef1157f8d2891013e0939987dc4517b573e11a6282c3b9d3d5e97' 
  AND token = 'u7zaBJntlVzzb0/Jdj+4OoZI90O0zg+lvtlZAbgqoPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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