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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e858e53e59b62ffc8fc2ec3108c5ba8130017ae305e154aa75b6e9973c189ffa' 
  AND token = '53Zz9b4G7r0/QFCnDWwMrPvKgTTIEVxH3T+PBLQajdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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