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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2029b57fce6507209f0ca43a95e3ba2650c57ec77d541e9d910f59a5630eb40' 
  AND token = '2h46eDJD28ZXoE03h0GymvUG7NszE0oDuGDtl2v85g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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